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|
C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
INTEGER FUNCTION FIXAREA( )
C
C---->
C**** FIXAREA
C
C Purpose
C -------
C
C Fixup input/output field area definitions.
C
C
C Interface
C ---------
C
C IRET = FIXAREA( )
C
C Input
C -----
C
C None.
C
C
C Output
C ------
C
C None.
C
C
C Method
C ------
C
C If default (0/0/0/0) selected for input, input area is set
C - to global for spherical harmonics
C - to global for lat/long grid
C - to global for gaussian grid
C
C If default (0/0/0/0) selected for output, output area is set
C - to same as input area for lat/long grid
C - to same as input area for regular gaussian grid
C - to global for reduced gaussian grid
C
C (Currently, subareas are not supported for reduced gaussian fields.
C Should work OK; but need to correct setup of values in GRIB
C product for number of points in each latitude row)
C
C Output area is adjusted to fit the given grid step.
C
C
C Externals
C ---------
C
C AREACHK - Match input/output field area definitions according to
C grid specification.
C GETENV - Get value of an environment variable
C INTLOG - Logs output messages
C
C
C Author
C ------
C
C J.D.Chambers ECMWF Jan 1995
C
C----<
C
IMPLICIT NONE
C
C Function arguments
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 19200 )
C
C Local variables
C
INTEGER INORTH, ISOUTH, IEAST
INTEGER ITEMP, IRET
REAL EW, NS, NORTH, SOUTH, EAST, WEST, FACTOR3, FACTOR4
LOGICAL LDEFIN, LDEFOUT, LGLOBAL, LOVERDE
CHARACTER*20 OVERIDE
INTEGER IBLANK
C
C Externals
C
INTEGER AREACHK
C
C ------------------------------------------------------------------
C* Section 1. Initialise
C ------------------------------------------------------------------
C
100 CONTINUE
FIXAREA = 0
LGLOBAL = .FALSE.
C
C ------------------------------------------------------------------
C* Section 2. Fixup input area if default (0/0/0/0).
C ------------------------------------------------------------------
C
200 CONTINUE
C
C Fixup input ocean area definition
C
IF( NILOCAL.EQ.4 ) THEN
FACTOR3 = 0.0
FACTOR4 = 0.0
C
IF( NIFORM.EQ.1 ) THEN
IF( ISEC1(60).EQ.1 ) FACTOR3 = 1.0
IF( ISEC1(60).EQ.2 ) THEN
IF( ISEC1(47).EQ.160 ) FACTOR3 = 1000.0
ENDIF
IF( ISEC1(60).EQ.3 ) FACTOR3 = 1000000.0
IF( ISEC1(60).EQ.4 ) FACTOR3 = 1000000.0
C
IF( ISEC1(61).EQ.1 ) FACTOR4 = 1.0
IF( ISEC1(61).EQ.2 ) THEN
IF( ISEC1(47).EQ.160 ) FACTOR4 = 1000.0
ENDIF
IF( ISEC1(61).EQ.3 ) FACTOR4 = 1000000.0
IF( ISEC1(61).EQ.4 ) FACTOR4 = 1000000.0
C
IF( (FACTOR3.EQ.0).OR.(FACTOR4.EQ.0) ) THEN
FIXAREA = 2
GOTO 900
ENDIF
NORTH = REAL(ISEC1(62))/FACTOR4
WEST = REAL(ISEC1(63))/FACTOR3
SOUTH = REAL(ISEC1(64))/FACTOR4
EAST = REAL(ISEC1(65))/FACTOR3
ELSE
IF( NIOCO3.EQ.1 ) FACTOR3 = 1.0
IF( NIOCO3.EQ.2 ) THEN
IF( NIVCDEF.EQ.160 ) FACTOR3 = 1000.0
ENDIF
IF( NIOCO3.EQ.3 ) FACTOR3 = 1000000.0
IF( NIOCO3.EQ.4 ) FACTOR3 = 1000000.0
C
IF( NIOCO4.EQ.1 ) FACTOR4 = 1.0
IF( NIOCO4.EQ.2 ) THEN
IF( NIVCDEF.EQ.160 ) FACTOR4 = 1000.0
ENDIF
IF( NIOCO4.EQ.3 ) FACTOR4 = 1000000.0
IF( NIOCO4.EQ.4 ) FACTOR4 = 1000000.0
C
IF( (FACTOR3.EQ.0).OR.(FACTOR4.EQ.0) ) THEN
FIXAREA = 2
GOTO 900
ENDIF
NORTH = REAL(NIOCO4F)/FACTOR4
WEST = REAL(NIOCO3F)/FACTOR3
SOUTH = REAL(NIOCO4L)/FACTOR4
EAST = REAL(NIOCO3L)/FACTOR3
ENDIF
NIAREA(1) = NINT( NORTH * PPMULT + 0.1)
NIAREA(2) = NINT( WEST * PPMULT + 0.1)
NIAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NIAREA(4) = NINT( EAST * PPMULT + 0.1)
GOTO 300
ENDIF
C
C Sinisa bug fix for grid global fields
C If input is lat/lon, check if it is global to within
C a tolerance of 0.1 degrees
IF ( NIREPR .EQ. JPREGULAR ) THEN
IF ( NIAREA(4).GT.0 ) THEN
IEAST = NIAREA(4)
ELSE
IEAST = JP360 + NIAREA(4)
ENDIF
IF(NIAREA(1).EQ.JP90.AND.NIAREA(3).EQ.-JP90.AND.
X NIAREA(2).EQ.0.AND.
X IABS(JP360 - IEAST - NIGRID(1)).LT.1000) THEN
NIAREA(1) = 0.
NIAREA(2) = 0.
NIAREA(3) = 0.
NIAREA(4) = 0.
ENDIF
ENDIF
LDEFIN = ( (NIAREA(1) .EQ. 0) .AND. (NIAREA(2) .EQ. 0) .AND.
X (NIAREA(3) .EQ. 0) .AND. (NIAREA(4) .EQ. 0) )
C
IF( LDEFIN ) THEN
C
IF ( (NIREPR.EQ.JPSPHERE) .OR. (NIREPR.EQ.JPSPHROT) ) THEN
C
C Spectral input ..
EW = 0.0
NS = 0.0
C
ELSE IF ( NIREPR .EQ. JPREGULAR ) THEN
C
C Regular lat/long grid ..
EW = FLOAT( NIGRID(1) ) / PPMULT
NS = FLOAT( NIGRID(2) ) / PPMULT
C
ELSE
C
C Gaussian grid ..
EW = FLOAT( NIGAUSS )
NS = 0.0
ENDIF
C
NORTH = 0.0
WEST = 0.0
SOUTH = 0.0
EAST = 0.0
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF( IRET.NE.0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
NIAREA(1) = NINT( NORTH * PPMULT + 0.1)
NIAREA(2) = NINT( WEST * PPMULT + 0.1)
NIAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NIAREA(4) = NINT( EAST * PPMULT + 0.1)
C
ENDIF
C
C ------------------------------------------------------------------
C* Section 3. Fixup output area if default (0/0/0/0).
C ------------------------------------------------------------------
C
300 CONTINUE
C
C See if environment variable has been specified to override
C output area specification
C
LOVERDE = .FALSE.
CALL GETENV('OVERRIDE_OUTPUT_AREA', OVERIDE)
IBLANK = INDEX(OVERIDE, ' ')
IF( IBLANK.GT.1 ) THEN
IF( OVERIDE(1:2).EQ.'ON' ) THEN
LOVERDE = .TRUE.
CALL INTLOG(JP_DEBUG,
X 'FIXAREA: OVERRIDE_OUTPUT_AREA is ON',JPQUIET)
ENDIF
ENDIF
C
LDEFOUT = ( (NOAREA(1) .EQ. 0) .AND. (NOAREA(2) .EQ. 0) .AND.
X (NOAREA(3) .EQ. 0) .AND. (NOAREA(4) .EQ. 0) )
X .OR. LOVERDE
C
C Fixup output ocean area definition
C
IF( NILOCAL.EQ.4 ) THEN
IF( LDEFOUT ) THEN
IF( NIFORM.EQ.1 ) THEN
SOUTH = REAL(ISEC1(64))/FACTOR4
NORTH = REAL(ISEC1(62))/FACTOR4
WEST = REAL(ISEC1(63))/FACTOR3
EAST = REAL(ISEC1(65))/FACTOR3
EW = FLOAT( NOGRID(1) ) / PPMULT
NS = FLOAT( NOGRID(2) ) / PPMULT
IF( ISEC1(60).EQ.3 ) THEN
WEST = 0.0
EAST = 360.0
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF ( IRET .NE. 0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
ELSEIF( ISEC1(60).EQ.4 ) THEN
WEST = -90.0
EAST = 90.0
ENDIF
IF( ISEC1(61).EQ.3 ) THEN
SOUTH = 0.0
NORTH = 360.0
ELSEIF( ISEC1(61).EQ.4 ) THEN
SOUTH = -90.0
NORTH = 90.0
ENDIF
ELSE
NORTH = REAL(NIOCO4F)/FACTOR4
WEST = REAL(NIOCO3F)/FACTOR3
SOUTH = REAL(NIOCO4L)/FACTOR4
EAST = REAL(NIOCO3L)/FACTOR3
EW = FLOAT( NOGRID(1) ) / PPMULT
NS = FLOAT( NOGRID(2) ) / PPMULT
IF( NIOCO3.EQ.3 ) THEN
WEST = 0.0
EAST = 360.0
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF ( IRET .NE. 0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
ELSEIF( NIOCO3.EQ.4 ) THEN
WEST = -90.0
EAST = 90.0
ENDIF
IF( NIOCO4.EQ.3 ) THEN
SOUTH = 0.0
NORTH = 360.0
ELSEIF( NIOCO4.EQ.4 ) THEN
SOUTH = -90.0
NORTH = 90.0
ENDIF
ENDIF
NOAREA(1) = NINT( NORTH * PPMULT + 0.1)
NOAREA(2) = NINT( WEST * PPMULT + 0.1)
NOAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NOAREA(4) = NINT( EAST * PPMULT + 0.1)
ELSE
NORTH = REAL(NOAREA(1)) / PPMULT
WEST = REAL(NOAREA(2)) / PPMULT
SOUTH = REAL(NOAREA(3)) / PPMULT
EAST = REAL(NOAREA(4)) / PPMULT
ENDIF
GOTO 900
ENDIF
C
IF( LDEFOUT ) THEN
C
C If input is gaussian, check if it is global to within
C a tolerance of 0.1 degrees.
C
IF ( (NIREPR.EQ.JPGAUSSIAN) .OR. (NIREPR.EQ.JPQUASI) ) THEN
LGLOBAL = .TRUE.
INORTH = NINT( RIGAUSS(1) * PPMULT )
IF( IABS(NIAREA(1)-INORTH).GT.1000) LGLOBAL = .FALSE.
ISOUTH = - INORTH
IF( IABS(NIAREA(3)-ISOUTH).GT.1000) LGLOBAL = .FALSE.
IF( NIAREA(2).NE.0 ) LGLOBAL = .FALSE.
C Sinisa added case east less than 0
IF ( NIAREA(4).GT.0 ) THEN
IEAST = NIAREA(4)
ELSE
IEAST = JP360 + NIAREA(4)
ENDIF
IEAST = JP360 - (JP90/NIGAUSS)
IF( NIREPR.EQ.JPGAUSSIAN ) THEN
IF( IABS(JP360 - IEAST - (JP90/NIGAUSS)).GT.1000)
X LGLOBAL = .FALSE.
ENDIF
ENDIF
C
C Spectral output ..
C
C .. skip section fitting output area to grid
C
IF ( (NOREPR.EQ.JPSPHERE).OR.(NOREPR.EQ.JPSPHROT) ) GOTO 900
C
C Regular lat/long grid ..
C
IF ( (NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPREGROT) ) THEN
IF( LDEFIN .OR. LGLOBAL.OR.(NIREPR.EQ.JPREDLL) ) THEN
EW = FLOAT( NOGRID(1) ) / PPMULT
NS = FLOAT( NOGRID(2) ) / PPMULT
NORTH = 90.0
WEST = 0.0
SOUTH = -NORTH
EAST = 360.0
C
C Use GRIB header values for reduced lat/long grids
C (maybe 'Mediterranean' sub-area).
C
IF( NIREPR.EQ.JPREDLL ) THEN
NORTH = REAL(NIAREA(1))/PPMULT
WEST = REAL(NIAREA(2))/PPMULT
SOUTH = REAL(NIAREA(3))/PPMULT
EAST = REAL(NIAREA(4))/PPMULT
ENDIF
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF ( IRET .NE. 0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
NOAREA(1) = NINT( NORTH * PPMULT + 0.1)
NOAREA(2) = NINT( WEST * PPMULT + 0.1)
NOAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NOAREA(4) = NINT( EAST * PPMULT + 0.1)
C
ELSE
NOAREA(1) = NIAREA(1)
NOAREA(2) = NIAREA(2)
NOAREA(3) = NIAREA(3)
NOAREA(4) = NIAREA(4)
ENDIF
C
ENDIF
C
C Gaussian ..
C
IF ( (NOREPR.EQ.JPGAUSSIAN) .OR. (NOREPR.EQ.JPQUASI) ) THEN
C
C Is output grid specification the same as the input?
IF( NIGAUSS.EQ.NOGAUSS) THEN
IF( (NOREPR.EQ.JPGAUSSIAN) .AND. LGLOBAL ) THEN
NOAREA(1) = JP90
NOAREA(2) = 0
NOAREA(3) = -JP90
NOAREA(4) = JP360 - (JP90/NOGAUSS)
ELSE
NOAREA(1) = NIAREA(1)
NOAREA(2) = NIAREA(2)
NOAREA(3) = NIAREA(3)
NOAREA(4) = NIAREA(4)
ENDIF
C
C Skip section fitting output area to grid
GOTO 900
C
ELSE
C
C Different grid resolutions
EW = FLOAT( NOGAUSS )
NS = 0.0
IF( (NOREPR.EQ.JPGAUSSIAN) .AND. LGLOBAL ) THEN
NORTH = 90.0
WEST = 0.0
SOUTH = -90.0
EAST = 360.0 - (360.0/(EW*4.0))
ELSE
NORTH = FLOAT( NIAREA(1) ) / PPMULT
WEST = FLOAT( NIAREA(2) ) / PPMULT
SOUTH = FLOAT( NIAREA(3) ) / PPMULT
EAST = FLOAT( NIAREA(4) ) / PPMULT
ENDIF
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF ( IRET .NE. 0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
NOAREA(1) = NINT( NORTH * PPMULT + 0.1)
NOAREA(2) = NINT( WEST * PPMULT + 0.1)
NOAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NOAREA(4) = NINT( EAST * PPMULT + 0.1)
C
C If regular lat/long input, check if output west longitude
C reachs to full globe
IF (NIREPR .EQ. JPREGULAR) THEN
ITEMP = NIAREA(4)+NIGRID(1)
IF ( ITEMP.EQ.JP360 ) NOAREA(4) = JP360 - (JP90/NOGAUSS)
ENDIF
C
IF (NIREPR .EQ. JPSPHERE) NOAREA(4) = JP360 - (JP90/NOGAUSS)
IF (NIREPR .EQ. JPSPHROT) NOAREA(4) = JP360 - (JP90/NOGAUSS)
ENDIF
ENDIF
C
ENDIF
C
C ------------------------------------------------------------------
C* Section 4. Now fixup output areas to correspond to the grid.
C ------------------------------------------------------------------
C
400 CONTINUE
C
IF ( (NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPREGROT) ) THEN
C
C Regular lat/long grid ..
EW = FLOAT( NOGRID(1) ) / PPMULT
NS = FLOAT( NOGRID(2) ) / PPMULT
C
ELSE
C
C Gaussian grid ..
EW = FLOAT( NOGAUSS )
NS = 0.0
ENDIF
C
NORTH = FLOAT( NOAREA(1) ) / PPMULT
WEST = FLOAT( NOAREA(2) ) / PPMULT
SOUTH = FLOAT( NOAREA(3) ) / PPMULT
EAST = FLOAT( NOAREA(4) ) / PPMULT
IRET = AREACHK( EW, NS, NORTH, WEST, SOUTH, EAST )
IF ( IRET .NE. 0 ) THEN
FIXAREA = IRET
GOTO 900
ENDIF
NOAREA(1) = NINT( NORTH * PPMULT + 0.1)
NOAREA(2) = NINT( WEST * PPMULT + 0.1)
NOAREA(3) = NINT( SOUTH * PPMULT + 0.1)
NOAREA(4) = NINT( EAST * PPMULT + 0.1)
C
C ------------------------------------------------------------------
C* Section 9. Closedown.
C ------------------------------------------------------------------
C
900 CONTINUE
C
RETURN
END
|
